Stockholders’ Equity - Summary of Stock Repurchase Activity (Details) - USD ($)	9 Months Ended
	Sep. 30, 2021	Aug. 31, 2021	Feb. 28, 2021	Jan. 31, 2020
Equity [Abstract]
Shares Repurchased (in shares)	60,000,000
Average Price per Share (in usd per share)	$ 67.11
Value of Shares Repurchased	$ 4,042,000,000
Shares Repurchased, Remaining Amount Authorized
Beginning balance	2,033,000,000
Authorization of additional plan		$ 3,000,000,000	$ 4,000,000,000	$ 5,000,000,000
Repurchase of shares of common stock	(4,042,000,000)
Ending balance	$ 4,991,000,000
Treasury shares retired (in shares)	0